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The annual profit nearly doubled by 80 times, the market value exceeded 160 billion in seven years, and in 2017, the sales of power batteries overtook Panasonic and BYD to become the top 20 enterprises in the world in terms of installed capacity in 2018. Ningde Times ranked first with 23.43GWh... Ningde Times is a veritable "unicorn" in the new energy automobile industry. What key technologies are driving the rapid development of this enterprise? Today, Xiaobian will take you to know the 14 core technologies of lithium battery manufacturing in Ningde era.

As of December 31, 2017, the Company and its subsidiaries had 907 domestic patents and 17 overseas patents, covering materials, cell design, battery packs, battery packs, energy storage systems and other fields.

The core technologies and their sources are as follows:

1. Core safety components

Purpose: It is used to solve the problem of battery threading and overcharging at the same time.

Core technology description: this technology can enable the power battery to form an independent protection circuit under overcharge and nail abuse, effectively protect the power battery, and ensure that each safety component plays its role in different accidents.

Source of technology: independent research and development.

2. Single electric core conductive sheet

Purpose: It is used to solve the overcharge problem of the battery.

Core technology description: the power battery provided by the technology can effectively prevent the conductive sheet from breaking, failure or deformation during use; Improve battery safety performance; On the premise of ensuring the safety of the battery, the conductive sheet is designed on the top cover to further reduce the occupation of additional battery space and improve the battery energy density.

Source of technology: independent research and development.

3. Copper aluminum composite pole

Purpose: It is used for copper aluminum conversion of the negative pole, so that the aluminum bar can be laser welded with the negative pole.

Core technology description: the power battery top cover structure provided by this technology can convert copper to aluminum on the negative pole, and can effectively avoid cracking or even disconnection of the junction surface between the upper and lower pole sections, so as to ensure the consistency and reliability of the connection between batteries.

Source of technology: independent research and development.

4. Polar sheet rolling drawing technology

Purpose: It is used for rolling and stretching the pole piece to improve the extension uniformity of the pole piece.

Core technology description: this technology can effectively reduce or even eliminate the wrinkling of the strip and improve the flatness of the strip; Increase the compaction density of the pole piece.

Source of technology: independent research and development.

5. High speed winding technology of electrode diaphragm

Purpose: To realize high-speed winding of electrode diaphragm and reduce cost.

Core technology description: the technology provides a rolling product processing device, which comprises a rolling needle and a shaping mechanism, wherein the shaping mechanism comprises a movable part, a first acting part and a second acting part, and the outer surface of the rolling needle is provided with a receiving groove; By improving the winding needle and the corresponding mechanical components, the company not only improves the winding speed, but also realizes the good control of the diaphragm tension.

Source of technology: independent research and development.

6. Electrolyte technology for ternary system low impedance products

Use: for ternary system products.

Core technology description: this technology provides an electrolyte formula that can be used for ternary system products, which can form an effective interface film on both the anode and cathode, so that the battery has a good storage life and reduces the battery impedance at the same time.

Source of technology: independent research and development.

7. Electrolyte technology for inhibiting gas production in ternary system

Use: for ternary system products.

Core technology description: this technology provides an electrolyte formula that can be used for ternary system products, which can significantly improve the gas production of the battery system using this formula, and has a high capacity retention rate and good low-temperature power performance.

Source of technology: independent research and development.

8. A modified negative active material technology

Use: For ternary system products or lithium iron phosphate system products.

Core technology description: this technology provides a modified negative electrode active material, which can better improve the dynamic performance, storage performance and cycle life of the battery compared with the traditional technology.

Source of technology: independent research and development.

9. Battery pack thermal management technology

Purpose: It is used to heat or cool the battery pack.

Core technology description: the battery pack thermal management module using this technology can effectively improve the cooling efficiency of the battery pack and ensure the consistency of battery temperature; The company improves cooling efficiency and realizes heating by setting thermal management components.

Source of technology: independent research and development.

10. Frame structure of battery module

Purpose: It is used to hold and fix multiple single batteries and absorb the expansion force of the battery.

Core technology description: the battery module using this technology adopts a lower shell with multiple grids and an upper cover with conductive connectors and safety valves, which makes full use of the space between the cells and improves the production efficiency; The company improves space utilization by simplifying the module structure.

Source of technology: independent research and development.

11. Module Pack Integration Technology

Purpose: It is used to simplify the structure of battery box, improve energy density and reduce cost.

Core technology description: this technology can make the battery box and the electric cell arranged inside it be bonded by structural adhesive, and the structural adhesive can play the role of fixing the electric cell.

Source of technology: independent research and development.

12. Automatic laser welding machine technology

Purpose: To improve the efficiency and efficiency of welding process in battery production.

Core technology description: this technology can effectively reduce the welding temperature, ensure the stability of the welding process, and improve the welding excellence and efficiency; By improving the consistency of laser output and linkage control of various mechanisms, the welding excellence rate is improved.

Source of technology: independent research and development.

13. Assembly process technology of battery module

Purpose: It is used for rapid assembly of battery modules to improve the safety and reliability of battery modules.

Core technology description: this technology can improve the anti vibration stability and electrical connectivity of the battery module, and can quickly dissipate the heat of the battery, thus improving the safety and reliability of the battery module.

Source of technology: independent research and development.

14. Calculation method of residual capacity of power battery pack

Purpose: To accurately calculate the remaining capacity of the battery pack.

Core technology description: This method reduces the error in the calculation of the residual capacity of the power battery pack by introducing charge correction coefficient and discharge correction coefficient.

Source of technology: independent research and development.

The core technology of Ningde era mainly comes from the technology accumulation conducted by the technology research and development team with Wu Kai, Zhao Fenggang, Xiang Yanhuo, Hu Jianguo, Tang Honghui as the core. The professional qualifications, important scientific research achievements and awards of the five core technicians are as follows:

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